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Sunday, 26 February 2012

WHAT IS THE DIFFERENCE BETWEEN ONLINE AND OFF-LINE UPS?

Offline UPS

Offline
UPS supply grid power to electrical and electronic devices during
normal power supply. It switches to battery power only during power
failures and other power problems. As the grid power is bypassed to the
load during normal power supply, it is known as Offline UPS. As the UPS
is used only during power problems it is also known as Standby UPS.
Offline UPS is also spelled as Off-Line UPS or Off Line UPS.
Apart
from bypassing power to the load, Offline UPS also charges the
connected batteries during normal power supply. The bypassing of power
results in exposing the load to electrical noises and surges. Therefore,
they are not recommended for very sensitive and critical electronic
devices. During power failures and other power problems, they switch
from grid power to battery power fast enough to prevent computers from
rebooting. The switchover time is usually between 2 to 20ms.

Online UPS

Online
UPS supply power to electrical and electronic devices from batteries
all the time. The UPS first converts grid power to charge the batteries
and then discharges the batteries to power the load. As the battery
power is supplied to the load at all times, it is known as Online UPS.
The grid power is converted from (Alternating Current) AC to DC (Direct
Current) to charge the battery and the battery power is converted from
DC to AC to power the load. Therefore online UPS is also known as Double
Conversion UPS.
As Online UPS always provides power from the
battery, the load always gets clean power regardless of any power
problems. Therefore, Online UPS is recommended for sensitive and
critical electronic devices. Online UPS provide a layer of insulation or
electric firewall. Any change in the input voltage or frequency does
not affect the output voltage and frequency. Therefore, the load is
shielded from all power problems.

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